CN112714841A - Parking locking device for gearbox with parking locking wheel - Google Patents
Parking locking device for gearbox with parking locking wheel Download PDFInfo
- Publication number
- CN112714841A CN112714841A CN201980060052.9A CN201980060052A CN112714841A CN 112714841 A CN112714841 A CN 112714841A CN 201980060052 A CN201980060052 A CN 201980060052A CN 112714841 A CN112714841 A CN 112714841A
- Authority
- CN
- China
- Prior art keywords
- piston
- parking lock
- activation
- spring
- axially
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000004913 activation Effects 0.000 claims abstract description 57
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3416—Parking lock mechanisms or brakes in the transmission
- F16H63/3425—Parking lock mechanisms or brakes in the transmission characterised by pawls or wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/3416—Parking lock mechanisms or brakes in the transmission
- F16H63/3483—Parking lock mechanisms or brakes in the transmission with hydraulic actuating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H2061/2869—Cam or crank gearing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear-Shifting Mechanisms (AREA)
- Braking Arrangements (AREA)
Abstract
The invention relates to a parking lock (1) for a motor vehicle transmission having a parking lock wheel (2), comprising a pawl (3) which is designed to interact with a toothing of the parking lock wheel (2) in order to lock a rotation of the parking lock wheel (2) in a locked position and to unlock a rotation of the parking lock wheel (2) in an unlocked position, wherein the pawl (3) can be actuated by an activation cam (5) and can rotate about a first rotational axis (4a), wherein the activation cam (5) can be actuated by a cylinder assembly (6) and can rotate about a second rotational axis (4b), wherein the cylinder assembly (6) has a piston (8) which is axially guided in a cylinder (7) and can be actuated axially, wherein the cylinder assembly (6) has a shaft (11), which is axially connected to the piston (8) and is guided in an axially movable manner in a housing (12).
Description
Technical Field
The invention relates to a parking lock device for a motor vehicle gearbox with a parking lock wheel.
Background
The parking brake device is provided for engagement by means of a pawl into an engagement tooth of a parking brake wheel of a motor vehicle transmission when operated by a driver of the motor vehicle, in order to lock a transmission output shaft, which is operatively connected to the parking brake wheel, against rotation by means of this engagement of the pawl and thus prevent a rolling-away of the motor vehicle. Furthermore, parking locks are known from DE 102014106527 a1, DE 102014208374 a1 and CN 106931161 a.
One commonly known parking lock device includes a pawl that is actuatable by an activation cam and rotates about a first axis of rotation, wherein the activation cam is actuatable by a cylinder assembly and rotates about a second axis of rotation. The cylinder assembly comprises a piston which is axially guided in a cylinder and can be axially actuated, and a shaft which is axially connected to the piston and is guided in an axially movable manner in a housing. The piston is operatively connected to the activation cam by a pivoting arm acted upon by a torsion spring. The construction of the activation mechanism is of corresponding complexity and requires a corresponding installation space.
Disclosure of Invention
The object of the invention is to provide a parking brake device which is compact. This task is achieved by the description object of claim 1. For preferred embodiments please refer to the corresponding claims.
A parking lock according to the invention for a motor vehicle transmission with a parking lock wheel comprises a pawl which is designed to interact with an engagement tooth of the parking lock wheel in order to lock the rotation of the parking lock wheel in a locked position and to unlock the rotation of the parking lock wheel in an unlocked position, wherein the pawl can be actuated by an activation cam and can rotate about a first rotational axis, wherein the activation cam can be actuated by a cylinder assembly and can rotate about a second rotational axis, wherein the cylinder assembly has a piston which is axially guided in a cylinder and can be actuated axially, wherein the cylinder assembly has a shaft which is axially connected to the piston and is guided in an axially movable manner in a housing, wherein the piston is designed as a hollow piston, and has an activation tappet guided therein, wherein the activation tappet is prestressed in the axial direction by means of a spring element and is operatively connected to the activation cam.
In other words, the pawl is designed to engage in a tooth groove of the parking lock wheel in the locked position, wherein the cylinder assembly actuates the pawl between the locked position and the unlocked position by means of the activation cam. By designing the piston as a hollow piston and arranging the spring element and the activation tappet inside the piston, a compact and easily assembled unit is provided, so that the parking lock can be optimized.
Preferably, a cylindrical pin is provided on one end face of the shaft, wherein the spring element abuts against the end face of the shaft and is arranged at least partially around the cylindrical pin. The cylindrical pin in particular forms a stop surface for the activation tappet. Furthermore, the cylindrical pin is provided as an assembly aid and serves for guiding the spring element.
Preferably, the shaft has an axial bore for receiving the cylindrical pin. The axial bore is designed in particular as a central bore in one end face of the shaft. The cylindrical pin is preferably received in the axial bore in a force-fitting manner, in particular in a press-fitting manner with the axial bore.
Furthermore, the activation tappet is preferably mounted rotatably on the lever arm of the activation cam by means of a pin. In other words, a pin extends transversely and through a matching hole on the activation tappet and a matching hole on the lever arm of the activation cam, so that a rotational movement and a force transmission between the activation tappet and the activation cam are achieved. In particular, the linear movement of the activation cam is converted into a rotational movement of the activation cam.
Preferably, the activation tappet has a radially widened portion, wherein a first and a second pin element at least partially penetrate radially through the plunger and are provided for forming a widened stop on the activation tappet. The radially widened portion is in the form of a collar and is designed around the activation tappet, on the one hand to facilitate tilting of the activation tappet in the plunger, and on the other hand to form a surrounding counter surface for the stop surfaces of the two pin elements. By means of the two pin elements, the plunger tappet and the spring element can be easily and reliably mounted in the plunger, and the maximum extension of the activation tappet out of the plunger can be limited, wherein the activation tappet is pretensioned by means of the spring element relative to the two pin elements.
Preferably, a piston spring is arranged axially between the housing and the piston. The piston spring pretensions the piston axially and for this purpose is supported axially on the housing and on the piston.
Preferably, the spring constant of the piston spring is greater than the spring constant of the spring element. In other words, the spring element is softer than the piston spring.
The invention comprises the following technical principles: the spring element is designed as a compression spring. The piston spring is also designed in particular as a compression spring. Thus, the spring element and the piston spring act in the same direction, i.e. in the longitudinal direction of the piston.
Preferably, a working chamber for receiving a liquid fluid for actuating the piston is provided in the space between the cylinder and the piston. The fluid is designed in particular as an incompressible pressure medium, in particular a hydraulic liquid. Depending on the design of the cylinder and the arrangement of the piston in the working chamber, the actuation of the piston can be effected by the outflow or inflow of fluid in the working chamber. In particular, an actuator with a shut-off valve is arranged on the cylinder and is inserted into the working chamber in order to achieve the inflow and outflow of the fluid.
Preferably, a tensioning spring is arranged on the pawl, wherein the tensioning spring is designed to return the pawl into the unlocking position. Preferably, the tension spring is inserted into a matching notch on the pawl. In the case of a rotation of the activation cam into the unlocking position, the tensioning spring acts on the pawl, so that the pawl is pulled out of the tooth gap on the parking lock wheel, which in turn unlocks the rotation of the parking lock wheel.
In particular, it is proposed to use the parking lock according to the invention in conjunction with a parking lock wheel of a motor vehicle transmission. The parking lock is preferably integrated in the gearbox.
Drawings
The measures for further improving the invention will be described in detail below in connection with the description of preferred embodiments of the invention on the basis of two figures.
FIG. 1 is a schematic cross-sectional view for explaining a parking lock device according to the present invention, and
fig. 2 is a schematic perspective cross-sectional view of the parking lock device shown in fig. 1.
Detailed Description
Fig. 1 and 2 show a parking lock 1 according to the invention for a motor vehicle transmission (not shown here). In fig. 1 only the parking lock wheel 2 of the gearbox is shown. Furthermore, fig. 1 also shows a ratchet 3, which is hidden in fig. 2 and thus not shown. Furthermore, for perspective reasons, all reference numerals in fig. 1 are likewise not shown in fig. 2.
In fig. 1, the pawl 3 of the parking lock 1 is shown in the unlocked position. The pawl 3 is not engaged in the tooth groove of the engaging teeth on the parking lock wheel 2, and therefore, the parking lock wheel 2 is in the unlocked state and can rotate freely. The pawl 3 is designed to interact with an engagement tooth of the parking lock wheel 2 in order to lock the parking lock wheel 2 in a locked position (not shown here), which can be actuated by the activation cam 5 and rotated about the first rotational axis 4 a. The activation cam 5 can be actuated by the cylinder assembly 6 and rotated about the second rotation axis 4 b. Upon entering the locking position of the parking lock 1, the activation cam 5 and the pawl 3 rotate in the counterclockwise direction about the corresponding rotation shafts 4b, 4 a.
The cylinder assembly 6 comprises a cylinder 7 and a piston 8 which is axially guided in the cylinder 7 and can be actuated axially and is designed as a hollow piston and has a sealing element 22 on its circumferential surface facing the cylinder 7. The cylinder 7 is hidden in fig. 2 so that the piston 8 can be seen. Furthermore, the cylinder block 6 comprises a shaft 11, which partially protrudes into the piston 8 and is connected to the piston 8 in an axial and rotationally fixed manner. The shaft 11 is guided in an axially movable manner in a fixedly arranged housing 12. The piston spring 19 is arranged axially between the housing 12 and the piston 8 and pretensions the piston 8 in the axial direction. A working chamber 20 is formed in the space between the cylinder 7 and the piston 8 for receiving a pressure medium for actuating the piston 8. The working chamber 20 is acted upon by an incompressible pressure medium, which acts against the spring force of the piston spring 19.
The piston 8 has an activation tappet 9 guided therein. The activation tappet 9 is axially pretensioned by a spring element 10 and forms an effective connection with the activation cam 5. The spring element 10 abuts on the one hand on the end face of the shaft 11 and on the other hand on the activation tappet 9. Furthermore, a cylindrical pin 13 is arranged on this end face of the shaft 11, wherein an axial bore 14 is formed on the end face of the shaft 11, which bore is provided to receive the cylindrical pin 13. The spring element 10 is arranged partly around the cylindrical pin 13. The spring element 10 and the piston spring 19 are designed as compression springs. The spring constant of the piston spring 19 is greater than the spring constant of the spring element 10.
The piston spring 19 is shown in a state of maximum compression, in which the piston 8 abuts against the end-face cylinder section 21 of the housing 12. Furthermore, the spring element 10 is in a pretensioned and maximally extended state. The activation tappet 9 protrudes to the greatest extent from the piston 8 and bears axially against the stop. The first and second pin elements 18a, 18b pass radially through complementary holes in the piston 8 and are provided to constitute stops for activating the tappet 9. The activation tappet 9 is mushroom-shaped and has a radial widening 17 at the end facing the spring element 10, wherein the radial widening 17 abuts on the two pin elements 18a, 18b and facilitates tilting of the activation tappet 9 in the plunger 8. Furthermore, the activation tappet 9 is rotatably mounted on a lever arm 16 of the activation cam 5 by means of a pin 15.
As soon as fluid is discharged from the working chamber 20, the piston 8 is moved axially by the piston spring 19 in the direction of the activation of the tappet 9, wherein the piston spring 19 is expanded and the spring element 10 is compressed. The activation tappet 9 projects further into the piston 8 and abuts against the end face of the cylindrical pin 13, wherein the activation cam 5 does not rotate. As a result, the relative position between the piston 8 and the activation tappet 9 changes, wherein the relative position between the activation tappet 9 and the activation cam 5 remains unchanged. However, the actuation force of the activation cam 5 on the pawl 3 increases because of the spring constant of the piston spring 19 relative to the spring constant of the spring element 10. As soon as the actuating force is greater than the counter force of the rotating parking lock wheel 2 on the pawl 3, the spring element 10 is also extended, wherein the activation tappet 9 protrudes from the piston 8 and twists the activation cam 5, so that it presses the pawl 3 into the tooth gap of the parking lock wheel 2, thereby locking the rotation of the parking lock wheel 2.
Description of the reference numerals
1 parking lock device
2 parking locking wheel
3 pawl
4a, 4b rotation axis
5 activating cam
6 cylinder body subassembly
7 cylinder body
8 piston
9 activating the tappet
10 spring element
11 axle
12 casing
13 cylindrical pin
14 axial hole
15 pin
16 lever arm
17 widened portion
18a, 18b pin element
19 piston spring
20 working chamber
21 cylinder block section
22 sealing element
Claims (9)
1. Parking lock device (1) for a motor vehicle transmission with a parking lock wheel (2), comprising a pawl (3) which is designed to interact with an engagement tooth of the parking lock wheel (2) in order to lock the rotation of the parking lock wheel (2) in a locked position and to unlock the rotation of the parking lock wheel (2) in an unlocked position, wherein the pawl (3) can be actuated by an activation cam (5) and can rotate about a first rotational axis (4a), wherein the activation cam (5) can be actuated by a cylinder assembly (6) and can rotate about a second rotational axis (4b), wherein the cylinder assembly (6) has a piston (8) which is axially guided in a cylinder (7) and can be actuated axially, wherein the cylinder assembly (6) has a shaft (11), which is axially connected to the piston (8) and is guided in an axially movable manner in a housing (12),
characterized in that the piston (8) is designed as a hollow piston and has an activation tappet (9) guided therein, wherein the activation tappet (9) is prestressed in the axial direction by means of a spring element (10) and is operatively connected to the activation cam (5).
2. Parking lock device (1) according to claim 1,
characterized in that a cylindrical pin (13) is arranged on one end face of the shaft (11), wherein the spring element (10) abuts on the end face of the shaft (11) and is arranged at least partially around the cylindrical pin (13).
3. Parking lock device (1) according to claim 2,
characterized in that said shaft (11) has an axial hole (14) for housing said cylindrical pin (13).
4. Parking lock (1) according to one of the preceding claims,
characterized in that the activation tappet (9) is rotatably mounted on a lever arm (16) of the activation cam (5) by means of a pin (15).
5. Parking lock (1) according to one of the preceding claims,
characterized in that a piston spring (19) is arranged axially between the housing (12) and the piston (8).
6. Parking lock device (1) according to claim 5,
characterized in that the spring constant of the piston spring (19) is greater than the spring constant of the spring element (10).
7. Parking lock device (1) according to claim 5 or 6,
characterized in that the piston spring (19) is designed as a compression spring.
8. Parking lock (1) according to one of the preceding claims,
characterized in that the spring element (10) is designed as a compression spring.
9. Parking lock (1) according to one of the preceding claims,
characterized in that a working chamber (20) is provided in the space between the cylinder (7) and the piston (8) for receiving a fluid for actuating the piston (8).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018130485.4 | 2018-11-30 | ||
| DE102018130485.4A DE102018130485B4 (en) | 2018-11-30 | 2018-11-30 | Parking lock device for a transmission with a parking lock wheel |
| PCT/DE2019/101009 WO2020108700A1 (en) | 2018-11-30 | 2019-11-25 | Parking lock device for a transmission with a parking lock wheel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112714841A true CN112714841A (en) | 2021-04-27 |
| CN112714841B CN112714841B (en) | 2022-08-09 |
Family
ID=68965587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980060052.9A Active CN112714841B (en) | 2018-11-30 | 2019-11-25 | Parking locking device for gearbox with parking locking wheel |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112714841B (en) |
| DE (1) | DE102018130485B4 (en) |
| WO (1) | WO2020108700A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112555406B (en) * | 2020-12-08 | 2022-04-08 | 磐吉奥(湖南)工业有限公司 | Parking braking mechanism |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090158877A1 (en) * | 2007-12-21 | 2009-06-25 | Gm Global Technology Operations, Inc. | Park inhibition solenoid assembly |
| KR100994104B1 (en) * | 2010-08-02 | 2010-11-12 | 주식회사 유니크 | Parking lock apparatus for automatic transmission |
| CN104179968A (en) * | 2013-05-24 | 2014-12-03 | 通用汽车环球科技运作有限责任公司 | Transmission parking pawl actuation assembly |
| CN205101546U (en) * | 2015-11-04 | 2016-03-23 | 科力远混合动力技术有限公司 | Electromechanical coupling gearbox parking mechanism |
| CN207297854U (en) * | 2017-08-14 | 2018-05-01 | 株洲欧格瑞传动股份有限公司 | A kind of parking device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014208374A1 (en) * | 2014-05-05 | 2015-11-05 | Zf Friedrichshafen Ag | Parking lock actuator for a hydraulically operated parking lock of an automatic transmission |
| CN106931161B (en) * | 2015-12-30 | 2019-06-18 | 长城汽车股份有限公司 | A kind of hydraulic halting mechanism and automatic transmission |
-
2018
- 2018-11-30 DE DE102018130485.4A patent/DE102018130485B4/en active Active
-
2019
- 2019-11-25 CN CN201980060052.9A patent/CN112714841B/en active Active
- 2019-11-25 WO PCT/DE2019/101009 patent/WO2020108700A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090158877A1 (en) * | 2007-12-21 | 2009-06-25 | Gm Global Technology Operations, Inc. | Park inhibition solenoid assembly |
| KR100994104B1 (en) * | 2010-08-02 | 2010-11-12 | 주식회사 유니크 | Parking lock apparatus for automatic transmission |
| CN104179968A (en) * | 2013-05-24 | 2014-12-03 | 通用汽车环球科技运作有限责任公司 | Transmission parking pawl actuation assembly |
| CN205101546U (en) * | 2015-11-04 | 2016-03-23 | 科力远混合动力技术有限公司 | Electromechanical coupling gearbox parking mechanism |
| CN207297854U (en) * | 2017-08-14 | 2018-05-01 | 株洲欧格瑞传动股份有限公司 | A kind of parking device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018130485B4 (en) | 2020-06-18 |
| WO2020108700A1 (en) | 2020-06-04 |
| CN112714841B (en) | 2022-08-09 |
| DE102018130485A1 (en) | 2020-06-04 |
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Effective date of registration: 20240320 Address after: 1st Floor, Building 2, No. 1 Antuo Road, Anting Town, Jiading District, Shanghai Patentee after: SCHAEFFLER HOLDING(CHINA) Co.,Ltd. Country or region after: China Address before: German Herzogenaurach Patentee before: SCHAEFFLER TECHNOLOGIES AG & CO.KG Country or region before: Germany |